<template>
  <view class="uni-swiper__warp">
    <slot/>
    <view v-if="mode === 'default'" :style="{'bottom':dots.bottom + 'px'}" class="uni-swiper__dots-box" key='default'>
      <view v-for="(item,index) in info" @click="clickItem(index)" :style="{
        'width': (index === current? dots.width*2:dots.width ) + 'px','height':dots.width/2 +'px' ,'background-color':index !== current?dots.backgroundColor:dots.selectedBackgroundColor,'border-radius':'0px'}"
            :key="index" class="uni-swiper__dots-item uni-swiper__dots-bar"/>
    </view>
    <view v-if="mode === 'dot'" :style="{'bottom':dots.bottom + 'px'}" class="uni-swiper__dots-box" key='dot'>
      <view v-for="(item,index) in info" @click="clickItem(index)" :style="{
        'width': dots.width + 'px','height':dots.height +'px' ,'background-color':index !== current?dots.backgroundColor:dots.selectedBackgroundColor,'border':index !==current ? dots.border:dots.selectedBorder}"
            :key="index" class="uni-swiper__dots-item"/>
    </view>
    <view v-if="mode === 'round'" :style="{'bottom':dots.bottom + 'px'}" class="uni-swiper__dots-box" key='round'>
      <view v-for="(item,index) in info" @click="clickItem(index)" :class="[index === current&&'uni-swiper__dots-long']"
            :style="{
		    'width':(index === current? dots.width*3:dots.width ) + 'px','height':dots.height +'px' ,'background-color':index !== current?dots.backgroundColor:dots.selectedBackgroundColor,'border':index !==current ? dots.border:dots.selectedBorder}"
            :key="index" class="uni-swiper__dots-item "/>
    </view>
    <view v-if="mode === 'nav'" key='nav' :style="{'background-color':dotsStyles.backgroundColor,'bottom':'0'}"
          class="uni-swiper__dots-box uni-swiper__dots-nav">
      <text :style="{'color':dotsStyles.color}" class="uni-swiper__dots-nav-item">
        {{ (current + 1) + "/" + info.length + ' ' + info[current][field] }}
      </text>
    </view>
    <view v-if="mode === 'indexes'" key='indexes' :style="{'bottom':dots.bottom + 'px'}" class="uni-swiper__dots-box">
      <view v-for="(item,index) in info" @click="clickItem(index)" :style="{
        'width':dots.width + 'px','height':dots.height +'px' ,'color':index === current?dots.selectedColor:dots.color,'background-color':index !== current?dots.backgroundColor:dots.selectedBackgroundColor,'border':index !==current ? dots.border:dots.selectedBorder}"
            :key="index" class="uni-swiper__dots-item uni-swiper__dots-indexes">
        <text class="uni-swiper__dots-indexes-text">{{ index + 1 }}</text>
      </view>
    </view>
  </view>
</template>

<script>

/**
 * SwiperDod 轮播图指示点
 * @description 自定义轮播图指示点
 * @tutorial https://ext.dcloud.net.cn/plugin?id=284
 * @property {Number} current 当前指示点索引，必须是通过 `swiper` 的 `change` 事件获取到的 `e.detail.current`
 * @property {String} mode = [default|round|nav|indexes] 指示点的类型
 *  @value defualt 默认指示点
 *  @value round 圆形指示点
 *  @value nav 条形指示点
 *  @value indexes 索引指示点
 * @property {String} field mode 为 nav 时，显示的内容字段（mode = nav 时必填）
 * @property {String} info 轮播图的数据，通过数组长度决定指示点个数
 * @property {Object} dotsStyles 指示点样式
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
  name: 'UniSwiperDot',
  emits: ['clickItem'],
  props: {
    info: {
      type: Array,
      default() {
        return []
      }
    },
    current: {
      type: Number,
      default: 0
    },
    dotsStyles: {
      type: Object,
      default() {
        return {}
      }
    },
    // 类型 ：default(默认) indexes long nav
    mode: {
      type: String,
      default: 'default'
    },
    // 只在 nav 模式下生效，变量名称
    field: {
      type: String,
      default: ''
    }
  },
  data() {
    return {
      dots: {
        width: 6,
        height: 6,
        bottom: 10,
        color: '#fff',
        backgroundColor: 'rgba(0, 0, 0, .3)',
        border: '1px rgba(0, 0, 0, .3) solid',
        selectedBackgroundColor: '#333',
        selectedBorder: '1px rgba(0, 0, 0, .9) solid'
      }
    }
  },
  watch: {
    dotsStyles(newVal) {
      this.dots = Object.assign(this.dots, this.dotsStyles)
    },
    mode(newVal) {
      if (newVal === 'indexes') {
        this.dots.width = 14
        this.dots.height = 14
      } else {
        this.dots.width = 6
        this.dots.height = 6
      }
    }

  },
  created() {
    if (this.mode === 'indexes') {
      this.dots.width = 12
      this.dots.height = 12
    }
    this.dots = Object.assign(this.dots, this.dotsStyles)
  },
  methods: {
    clickItem(index) {
      this.$emit('clickItem', index)
    }
  }
}
</script>

<style lang="scss" scoped>
.uni-swiper__warp {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: column;
  position: relative;
  overflow: hidden;
}

.uni-swiper__dots-box {
  position: absolute;
  bottom: 10px;
  left: 0;
  right: 0;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  justify-content: center;
  align-items: center;
}

.uni-swiper__dots-item {
  width: 8px;
  border-radius: 100px;
  margin-left: 6px;
  background-color: rgba(0, 0, 0, 0.4);
  /* #ifndef APP-NVUE */
  cursor: pointer;
  /* #endif */
  /* #ifdef H5 */
  // border-width: 5px 0;
  // border-style: solid;
  // border-color: transparent;
  // background-clip: padding-box;
  /* #endif */
  // transition: width 0.2s linear;  不要取消注释，不然会不能变色
}

.uni-swiper__dots-item:first-child {
  margin: 0;
}

.uni-swiper__dots-default {
  border-radius: 100px;
}

.uni-swiper__dots-long {
  border-radius: 50px;
}

.uni-swiper__dots-bar {
  border-radius: 50px;
}

.uni-swiper__dots-nav {
  bottom: 0px;
  // height: 26px;
  padding: 8px 0;
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  flex: 1;
  flex-direction: row;
  justify-content: flex-start;
  align-items: center;
  background-color: rgba(0, 0, 0, 0.2);
}

.uni-swiper__dots-nav-item {
  /* overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap; */
  font-size: 14px;
  color: #fff;
  margin: 0 15px;
}

.uni-swiper__dots-indexes {
  /* #ifndef APP-NVUE */
  display: flex;
  /* #endif */
  // flex: 1;
  justify-content: center;
  align-items: center;
}

.uni-swiper__dots-indexes-text {
  color: #fff;
  font-size: 12px;
  line-height: 14px;
}
</style>
